11 documents found, page 1 of 2
Thermal Properties of the Blends of Methyl and Ethyl Esters Prepared from Babas...
Nicolau,Cleber L.; Klein,Aline N. V.; Silva,Cinthia A. A.; Fiorucci,Antonio R.; Stropa,Jusinei M.; Santos,Elisandra O.; Borges,Kênia C. S.Fatty acid esters (methyl and ethyl) prepared from babassu nut oil were blended with the respective esters from soybean oil. These binary blends (babassu:soybean) were made in proportions of 10:90, 20:80, 30:70, 40:60, and 50:50 (vol%). The ester content of all the blends was higher than 96.5%, which is the minimum value required by the Brazilian National Agency of Petroleum, Natural Gas and Biofuels (Agência N...
Ultrasound-Promoted Synthesis of 3-(Thiophen-2-yl)-4,5-dihydro-1H-pyrazole-1-ca...
Santos,Eric F. S. dos; Cury,Nathália M.; Nascimento,Tainara A. do; Raminelli,Cristiano; Casagrande,Gleison A.; Pereira,Claudio M. P.3-(Thiophen-2-yl)-4,5-dihydro-1H-pyrazole-1-carboximidamides were efficiently prepared through a cyclocondensation of thiophenylchalcones with aminoguanidine hydrochloride under ultrasonic conditions in the presence of KOH and ethanol as a green solvent in short reaction times (15-35 min) and good yields (62-95%). All compounds produced were evaluated against the human Jurkat and RS4;11 acute lymphoblastic leuk...
COMPOSIÇÃO QUÍMICA E TEMPERATURA DE CRISTALIZAÇÃO DE ÉSTERES OBTIDOS DE QUATRO ...
Pierezana,Luciane; Cabral,Márcia Regina Pereira; Martins Neto,Deluana; Stropa,Jusinei Meireles; Oliveira,Lincoln Carlos Silva de; Scharf,Dilamara RivaThe seed oils from four plants (Scheelea phalerata, Butia capitata, Syagrus romanzoffiana, Terminalia cattapa) found in Mato Grosso do Sul were extracted at good yields. Alkaline transesterification of these seed oils to esters using methanol and ethanol was studied and also produced good yields. Oleic acid (30.5/32.3%), lauric acid (30.7/32.9%) methyl and ethyl esters, were the main components of transesterifi...
Chemical Composition and Cytotoxic Activity of the Root Essential Oil from Jatr...
Silva,Celia E. L. da; Minguzzi,Sandro; Silva,Rogério C. L. da; Matos,Maria F. C.; Tofoli,Danilo; Carvalho,João E. de; Ruiz,Ana L. T. G.The essential oil of roots of Jatropha ribifolia, obtained by hydrodistillation, was characterized in terms of its chemical composition by chromatographic method with flame ionization detection (GC-FID) and gas chromatography coupled to electron ionization mass spectrometry (GC-MS). The analyses and identification pointed by mass fragmentation pattern and retention index revealed the presence of 49 compounds, r...
Phytotoxic and antioxidant activity of seven native fruits of Brazil
Peres,Marize Terezinha Lopes Pereira; Lopes,José Rodrigo Regis; Silva,Cristiane Bezerra da; Cândido,Ana Carina Silva; Simionatto,EuclésioWe investigated antioxidant capacity, phenolic content and phytotoxic effects in seven species of fruit native to Brazil: Acrocomia aculeata, Hymenaea stigonocarpa, Tamarindus indica, Byrsonima intermedia, Psidium firmum, Myrciaria cauliflora and Ficus obtusifolia. Phytotoxic effects were assessed from crude ethanol extracts and semipurified fractions. In four of the seven fruits, total phenolic content, as det...
Potencial fitotóxico de Dicranopteris flexuosa (Schrad.) Underw. (Gleicheniaceae)
Silva,Valerí Schmidt da; Cândido,Ana Carina da Silva; Muller,Caroline; Laura,Valdemir Antônio; Faccenda,Odival; Simionatto,Euclésio; Hess,Sonia CorinaO objetivo deste trabalho foi determinar o potencial fitotóxico do extrato etanólico bruto e das frações semipurificadas de Dicranopteris flexuosa por meio de bioensaios de germinação e crescimento de Lactuca sativa L. (alface), Lycopersicon esculentum L. (tomate), Allium cepa L. (cebola) e Triticum aestivum L. (trigo) em laboratório e casa de vegetação e quantificar o teor total de fenóis e flavonóides dos ext...
Potencial alelopático da parte aérea de Senna occidentalis (L.) Link (Fabaceae,...
Cândido,Ana Carina da Silva; Schmidt,Valerí; Laura,Valdemir Antônio; Faccenda,Odival; Hess,Sônia Corina; Simionatto,EuclésioA bioatividade das frações semipurificadas (hexânica, acetato de etila e etanol-água) do extrato etanólico das partes aérea de S. occidentalis foi avaliada através de ensaios de germinação e de crescimento de Lactuca sativa (alface), Lycopersicon esculentum (tomate), Allium cepa (cebola) e Triticum aestivum (trigo), em laboratório. Foram utilizadas três concentrações (250, 500, 1000 mg L-1) de cada fração e um ...
Composição química e atividade alelopática do óleo volátil de Hydrocotyle bonar...
Silva,Cristiane B. da; Simionatto,Euclésio; Hess,Sônia C.; Peres,Marize T. L. P.; Simionatto,Edésio L.; W. Júnior,Alberto; Poppi,Nilva R.The volatile oil obtained from the leaves of Hydrocotyle bonariensis Lam (Araliaceae) was analyzed by GC, Chiral-GC and GC-MS. It was identified 14 compounds and the monoterpene (+)-limonene (53.6%) and sesquiterpene γ-muurolene (10.5%) were the main components. The allelopathic effects of the oil were evaluated against two seeds, Lactuca sativa and Allium cepa. The results show that the oil exhibited inhibitio...
Estudos químicos e biológicos de Microgramma vacciniifolia (Langsd. & Fisch...
Peres,Marize T. L. P.; Simionatto,Euclésio; Hess,Sônia C.; Bonani,Vanderléa F. L.; Candido,Ana C. S.; Castelli,Caroline; Poppi,Nilva R.; Honda,Neli K.Chemical studies with aerial parts of Microgramma vacciniifolia (Langsd. & Fisch.) Copel. afforded ²-sitosterol, hopan-22-ol, 6-metoxiapinenin-7-O-²-D-allopyranoside and a mixture containing ethyl esters of carboxilic acids. The structures of the coumpounds were elucidated by spectroscopy and GC-MS analysis. The total phenolics contents of the crude extract and fractions were determined by Folin-Ciocalteau ...
Chemical composition and evaluation of antibacterial and antioxidant activities...
Simionatto,Euclésio; Bonani,Vanderléa F. L.; Morel,Ademir Farias; Poppi,Nilva Ré; Raposo Júnior,Jorge Luiz; Stuker,Caroline Z.; Peruzzo,Gisele M.The essential oil obtained from the stem bark of Croton urucurana Baillon (Euphorbiaceae) was analysed by GC and GC-MS. 83 compounds were identified and borneol (14.7%), bornyl acetate (5.2%), 1-isopropyl-7-methyl-4-methylene-1,3,4,5,6,8-hexahydro-2H-naphthalen-4a-ol (14.7%), sesquicineole (10.5%) and gamma-gurjunene epoxide (5.4%) were the main components. The EC50 value of the crude essential oil in the DPPH ...